James doyle



(No Model.)

J. DOYLE.

PIPE WRENCH.

Patented May 6, 1884.

llru'rnn Starts Parent Orrren.

JAMES DOYLE, OF N ElV YORK, N. Y., ASSIGNOR TO HIMSELF AND PATRICKMONAMARA, OF SAME PLACE.

PlPE WRENCl'E.

SPECIFICATION forming part of Letters Patent No. 298,294=, dated May 6,1884.

Application filed October 8, 1883. (No model.)

T in whom it may concern.-

Be it known that I, JAMES DOYLE, of New York city, in the county andState of N ew York, have invented certain new and useful Improvements inPipe-Vrenches, of which the following is a specification.

. My improved wrench is of the kind employing a lever with a roughenedsurface to bear against the pipe, and chains of suiiicient lengthextending from the lever around the pipe and attached to the leverpermanently at one end and adjustable at the other. I, have devisedmeans whereby the chains are rapidly and conveniently adjusted with morethan usual nicety 1 to adapt the wrench to different sizes of pipe.

The following is a description of what I consider the best means ofcarrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 represents the device adjusted for a small pipe. Fig. 2 showsthe same adjusted for a large one. Fig. 2 shows a portion as seen fromthe opposite side. Figs. 3 and 4 repre- 2 sent modifications. Each is aside elevation of the wrench and a cross-section of the pipe on which itis applied. Fig. 5 is a plan view of the form shown in Fig. 1. V

Similar letters of reference indicate come sponding parts in all thefigures where they.

occur.

A is the lever, certain portions being designated by additional marks,as A, when necessary. The surface of the portion which grips 5 on thepipe is curved and finely toothed, as

indicated by A. i

B and O are chains of exactly equal length. One end of each is attachedto a stout pin, A, which is set transversely at the point 0 representedin the lever A. The other end. of each of the chains B G is attached toone end of a locking-piece, D, which is of a little less thickness thanthe lever A, and is providedwith teeth (I, uniformly placed on.

5 each edge. Three or more holes, a a" a, are bored in the lever A,which serve to receive bolts H, which are inserted through the holes ina triangular plate, E. The holes in the lever A are equidistant. Byremoving and insorting the bolts H anew the position of the plate E maybe changed, so as to be held against any two adjacent holes, a a or a aTwo or more notches, (4* a are produced on the upper edge of the leverA, each opposite a point midway between two of the holes. The inner faceof the plate E is formed with two stout dogs, M. Thelowermost matches inthe notch cfi when the plate E is held against the holes a a and matchesin thenotch 66 when the plate is held against the holes a a Theuppermost dog is at such distance from the lower dog and both are ofsuch size and form that when the locking-piece Dis properly ap plied thedogs match each in the notches (l of the locking-piece I), the lowermostmatching in a notch on the lower edge of D and theuppermost matching ina notch, cl, directly opposite, on the upper edge.

In applying the wrench for use, the leverA is held with the notchedsurface A against the pipe 0, (see Fig. 1,) and the locking-piece D,carrying the attached chains B O, is passed around the pipe, and,drawing the chains as tight as conveniently may be, is presented to thedogs M, so that the latter are received, re- 7 5 spectively, in anotch,d, one on the upper and the other on the lower edge of D. Thewrench is now ready to operate by being reciprocated.

Its motion in one direction will be of no effect. In the otherdirection,thatindicated by the arrow in Fig. 1, the chains will draw thesurface into tight contact with the pipe, and the teeth A will grip thepipe forcibly and compel the pipe to turn with the lever.

My pipe-wrench will serve with a wide range of diameters of pipe, andcan be adjusted to fine gradations. Small differences in diameters areallowed for by shifting the locking piece D forward and backward, so asto engage a different pair of its notches d with the 0 dogs M. Largedifferences in diameter are allowed for by taking out the bolts H,shifting the piece in one direction or the other, and inserting thebolts H in different holes in A, as a a", instead of a a.

Modifications may be made in the forms and proportions. Parts of theinvention can be used without the whole. Fig. 3 showsa construction inwhich the plate is dispensed with, and in its stead I elnploya singlehinged dog, :00

its

engaging only with the upper set of the teeth with this'modification thedog is lifted and the locking-piece D shifted inward or outward onenotch or more, and the dog engaged with a different notch, d. Fig.eishows another modi :fication. In this a rigid strap or bracket, K, isapplied to embrace the lever A, as shown, and secured by a single bolt,so as to hold it rigidly. Another bolt is inserted in the positionrepresented above the lever A, and when the locking-piece D is presentedthereto engages one of the lowermost teeth d. A pin attached by a shortlength of chain, Q, is inserted at will at a higher point in K to engagewith one of the notches d on the upper edge of D. This removable pin(marked M) serves as the upper dog to engage in the upper series ofteeth, (I. The adjustment for different sizes with this modificationwill be readily understood. The removable pin at the top is drawn outand the lockingpiece D d shifted forward or backward and the pinreinserted, engaging itself and the dog M in different notches, d. Forgreat changes of diameter of the pipe the bolt securing the strap K tothe lever A is removed and the bracket K shifted toa new position, andthe bolt inserted through a different hole, a, instead of a.

I claim as my invention- A pipe-wrench having chains B O, a lever, A,with its roughened surface A and notched locking-piece D d, incombination with each other and with dogging means M, adapted to engagein any of the several notches d, and with means, as H a, a", forchanging the point of attachment of the dogging means to the lever A,all substantially as herein specified.

In testimony whereof I have hereunto set my hand, at New York city, NewYork, this 28th day of September, 1883, in the presence of subscribingwitnesses.

' JAMES DOYLE.

\Vitn esses:

PATRICK MONAMARA, Tnos. E. OBRIEN, AUGUST 0. HAssEY.

